Blending Options-Gradient Overlay (for the blue button)
Gradient’s parameters:
Blending Options-Gradient Overlay (for the violet button)
Gradient’s parameters:
Take then this instrument and draw by a flare on each colored gradient (make by a copy for each of the buttons and change the parameters, according to the button’s color and its parameters)
and draw by a flare on each colored gradient (make by a copy for each of the buttons and change the parameters, according to the button’s color and its parameters) 
